Fwiw I’m familiar with docker and I certainly wouldn’t have understood it that way if you hadn’t said so. I wonder why they can’t just upstream the web gui either in addition or instead of the existing one.

Fork author here. It’s a bit more nuanced than that. The original version originally came with a webui that was removed upstream and replaced with a desktop app. The way it was written, there was some modification required to make with docker which was a popular request from the users. The desktop app isn’t dockerizable so this can’t be merged upstream.